Abstract: A flat key has a blade formed with bitting along at least one of its edges, with a pair of relatively shallow, outwardly open, and generally parallel but spaced grooves formed in at least one of its faces extending generally longitudinally in a nonstraight path from the tip, and with a relatively deep and outwardly open groove formed in the one face and extending generally longitudinally in a nonstraight path from the tip generally nonparallel to the shallow grooves. This key is used with a lock that has a relatively stationary lock housing containing a rotatable lock cylinder formed with an axially outwardly open flat passage shaped to snugly receive the key blade, and independent first and second slides displaceable in the cylinder generally of the axis and parallel to the one face of a key in the passage and provided with respective long and short formations engageable generally radially of the axis with the deep and shallow grooves.

Abstract: A lock cylinder comprises a cylinder housing and a cylinder core having at least one rotatable magnetic tumbler supported therein, in which at least one axially slidable locking element is provided. The locking element has projections thereon directed toward the exterior. The locking element has a contacting slider having contacting elements projecting toward the rotatable magnetic tumblers, and a locking slider engaged with and fit together with the contacting slider, on which are mounted the projections. The lock cylinder is also provided with a pressing member fixed with respect to the cylinder housing, by which the locking element in the O-position of the cylindrical core is held against the force of a compressible spring engaged to the locking element, and is pushed into an unlocking position on rotation of the cylindrical core.

Abstract: A closure device has a cylinder core turnable in a housing and a key insertable into a key channel in the core. A ball provided in a circumferential groove in the inner wall of the housing cooperates with an edge portion of the key. A pin is arranged in the same plane and 180.degree. away from the ball.

Abstract: A magnetizing system includes a transformer core, a first winding surrounding the core and a tube-like second winding surrounding the first winding. The second winding is formed with a slot on its upper surface and has a portion located within this slot and extending beyond the upper surface of said tube. This portion is formed with a cross-section of a size substantially smaller than the size of the slot to produce a magnetic field of high density. A screening socket is positioned adjacent the material to be magnetized. This socket is made of a material having good electrical conductivity for absorbing the stray fields so that the material to be magnetized is exposed to the magnetic field produced by said extended portion.

Abstract: A control device for a magnetic cylindrical lock having a cylindrical housing and a cylindrical plug disposed for rotational and axial movements in the housing, comprises a longitudinal boring in the plug, magnetic rotary members arranged for rotation across the longitudinal boring, and arresting means for blocking the rotation of the plug in one axial position of the latter and for permitting the rotary movement in another axial position.

Abstract: A lock has a cylinder formed with a keyhole and rotatable in a housing. At least one tumbler is displaceable into the keyhole into engagement with a bit of a key which can position the segments of the tumbler so as to allow rotation of the cylinder in the housing. In addition the key is provided with a magnet that can coact with a magnetic rotor to rotate this magnet into a position that aligns a notch on the magnet or a control wheel controlled thereby with a retaining element. The housing is formed at its back end with a recess in which one end of the retaining element is urged by a weak spring. Only when the notches on the rotors are aligned with tabs on the retaining element can this element be displaced out of the recess in the housing and allow rotation of the cylinder relative to the housing.